Insomnia in the McMaster Textbook of Internal Medicine

"Insomnia is defined as inadequate or poor sleep quality, difficulty falling asleep, frequent nocturnal awakenings, early morning awakening, and being unable to get back to sleep. The common result of insomnia is that someone feels unrefreshed on the following day, with daytime fatigue and drowsiness. It is often accompanied by deficits in functioning and performance—especially in the case of tasks requiring concentration, attention, memory, or precision—which the person may not recognize or acknowledge."

To learn more about this mental health concern, go to Insomnia.

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